Highly selective enrichment of radioactive cesium from solution by using zinc hexacyanoferrate(III)-functionalized magnetic bentonite.
Highly selective enrichment of radioactive cesium from solution by using zinc hexacyanoferrate(III)-functionalized magnetic bentonite.
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DOI：
10.1016/j.jcis.2020.06.115
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发表时间：
2020-07
影响因子：
9.9
通讯作者：
Shubin Yang;Shengkai Liao;X. Ren;Yun Li;Yuanyuan Ma;Zhuhong Zhang
中科院分区：
文献类型：
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作者：
Shubin Yang;Shengkai Liao;X. Ren;Yun Li;Yuanyuan Ma;Zhuhong Zhang
在复杂的环境体系中实现放射性Cs(I)的高效、选择性富集化，探索Cs(I)在吸附材料上的微尺度吸附机理，是开发高效Cs(I)吸附材料的关键。此外，材料的低细胞毒性对于实际应用和环境保护是必不可少的。本研究采用原位合成法将膨润土载体与高选择性Cs(I)进行可控组装，以期构建一种在复杂环境体系中对Cs(I)具有高吸附能力和高选择性的低毒功能粘土材料。采用间歇法对六氰基铁酸锌接枝磁性膨润土(简称ZHF/MB)复合材料的吸附等温线、动力学分析和选择性进行了评价。用人肝细胞(HepG2细胞)进行体外细胞毒性实验，评价ZHF/MB复合材料的毒性。结果表明，ZHF/MB复合材料对Cs+离子的吸附容量(1.638℃，60℃)不仅高于其他天然和人造材料，而且对人体细胞无细胞毒性。此外，ZHF/MB复合材料对Cs+表现出了良好的选择性，对溶液中Cs+的去除效率可达90%以上(m/V=60.4 mg/L，[Mn+]初始=1110 mg/L，Mn+=Cs+，Ni2+，Sr2+，Co2+)。ZHF/MB复合材料具有良好的安全毒理学特性、显著的Cs+吸附效率和良好的选择性，显示了其作为放射性铯修复脱孔剂的巨大潜力。本研究的实施将为放射性Cs(I)废物的治理提供新的吸附材料和方法。
Realizing highly effective and selective enrichment of radioactive Cs(I) in complex environmental systems and exploring the microscale adsorption mechanism of Cs(I) on adsorbing material is the key point for developing highly efficient materials for Cs(I) adsorption. In addition, the low cytotoxicity of materials is essential for practical applications and environmental protection. In this study, the controlled assembly of bentonite carrier with a highly selective substance of Cs(I) is prepared by in-situ synthesis method in order to construct a low-toxic functional clay material with high adsorption capacity and selectivity of Cs(I) in complex environmental systems. The efficiency of the zinc hexacyanoferrate(III)-grafted magnetic bentonite (denoted as ZHF/MB) composite was evaluated in adsorption isotherm studies, kinetics analyses, and selectivity tests by using the batch technique. The toxicity of the ZHF/MB composite was evaluated through in vitro cytotoxicity assays using human hepatic cells (HepG2 cells). The results revealed that the ZHF/MB composite had not only a higher adsorption capacity (1.638 mmol/g, 60 °C) for Cs+ions than a number of other natural and manmade materials but also no cytotoxicity in human cells. In addition, the ZHF/MB composite showed excellent selectivity for Cs+with a removal efficiency of over 90% from solution (m/V = 0.4 g/L, [Mn+]initial= 10 mg/L, Mn+= Cs+, Ni2+,Sr2+, Co2+). The promising safe toxicology profile, remarkable Cs+adsorption efficiency, and excellent selectivity of the ZHF/MB composite demonstrate its great potential for using as a decorporation agent for radioactive cesium remediation. The implementation of this research will provide new adsorption materials and method for radioactive Cs(I) waste management.